By Joseph Ax NEW YORK (Reuters) – A New York businessman must face criminal fraud charges for trying to claim a billion-dollar stake in social media company Facebook Inc, a federal judge ruled on Friday. Paul Ceglia, 40, is accused of forging a 2003 contract with Facebook CEO Mark Zuckerberg that supposedly entitled him to part ownership of the company. After an hour-long hearing in New York, U.S. District Judge Andrew Carter rejected Ceglia's request to throw out the charges, finding he had failed to meet the “high standard” needed to dismiss a grand jury indictment. Ceglia sued Zuckerberg and Facebook in 2010 in a federal court in Buffalo, New York, claiming that he and Zuckerberg had signed a contract while Zuckerberg was a freshman at Harvard University for Ceglia to invest $1,000 in a planned social networking website.